### All ACT Math Resources

## Example Questions

### Example Question #1 : How To Factor A Common Factor Out Of Squares

Which real number satisfies ?

**Possible Answers:**

**Correct answer:**

Simplify the base of 9 and 27 in order to have a common base.

(3^{x})(9)=27^{2}

= (3^{x})(3^{2})=(3^{3})^{2}

=(3^{x+2})=3^{6 }

Therefore:

x+2=6

x=4

^{ }

### Example Question #2 : How To Factor A Common Factor Out Of Squares

Which of the following is a factor of ?

**Possible Answers:**

**Correct answer:**

The terms of have as their greatest common factor, so

is a prime polynomial.

Of the five choices, only is a factor.

### Example Question #3 : How To Factor A Common Factor Out Of Squares

Simplify

**Possible Answers:**

**Correct answer:**

The easiest way to approach this problem is to break everything into exponents. is equal to and 27 is equal to . Therefore, the expression can be broken down into . When you cancel out all the terms, you get , which equals .

### Example Question #5 : Squaring / Square Roots / Radicals

Which of the following expression is equal to

**Possible Answers:**

**Correct answer:**

When simplifying a square root, consider the factors of each of its component parts:

Combine like terms:

Remove the common factor, :

Pull the outside of the equation as :

### Example Question #4 : How To Factor A Common Factor Out Of Squares

Which of the following is equal to the following expression?

**Possible Answers:**

**Correct answer:**

First, break down the components of the square root:

Combine like terms. Remember, when multiplying exponents, add them together:

Factor out the common factor of :

Factor the :

Combine the factored with the :

Now, you can pull out from underneath the square root sign as :

### Example Question #2323 : Act Math

Which of the following expressions is equal to the following expression?

**Possible Answers:**

**Correct answer:**

First, break down the component parts of the square root:

Combine like terms in a way that will let you pull some of them out from underneath the square root symbol:

Pull out the terms with even exponents and simplify:

### Example Question #4 : How To Factor A Common Factor Out Of Squares

What is,

?

**Possible Answers:**

**Correct answer:**

To find an equivalency we must rationalize the denominator.

To rationalize the denominator multiply the numerator and denominator by the denominator.

Factor out 6,

Extract perfect square 9 from the square root of 18.

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